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Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
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Ultrasonographic cystometry for neurogenic bladder using elastography.

Minh-Tung Do1, Keewon Kim2, Louis Kim1

  • 1Department of Urology, College of Medicine, Seoul National University, Seoul, South Korea.

Neurourology and Urodynamics
|November 16, 2020
PubMed
Summary
This summary is machine-generated.

Ultrasound shear wave elastography (SWE) measures bladder wall elasticity. This study found Young's modulus (YM) better correlates with intravesical pressure (Pves) than compliance, supporting its use in noninvasive cystometry.

Keywords:
elasticity imaging techniquesneurogenicurinary bladderurodynamics

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Area of Science:

  • Urology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Ultrasound shear wave elastography (SWE) measures elasticity (Young's modulus, YM) in solid organs.
  • Previous studies suggest YM correlates better with intravesical pressure (Pves) than bladder compliance, indicating potential for noninvasive cystometry.
  • However, theoretical considerations suggest YM should correlate more with compliance than Pves.

Purpose of the Study:

  • To re-evaluate the relationship between YM, Pves, and bladder compliance.
  • To optimize the use of YM for noninvasive urodynamic studies.
  • To compare YM measured by SWE with a calculated bladder wall modulus.

Main Methods:

  • Young's modulus (YM) was measured using SWE during bladder filling in 32 neurogenic bladder patients.
  • Modified dynamic compliance was calculated using a scatter plot smoothing algorithm from cystometry data.
  • YM was correlated with Pves, modified dynamic compliance, and a calculated bladder wall modulus.

Main Results:

  • YM showed a stronger correlation with Pves (r=0.72, p<0.0001) than with modified dynamic compliance (r=-0.43, p<0.0001).
  • The correlation between YM and Pves was higher than that with the calculated bladder wall modulus (r=0.52, p<0.0001).

Conclusions:

  • YM measured by SWE correlates better with Pves than compliance, consistent with prior research.
  • SWE may reflect the bladder's integrated capacity to hold urine and wall properties, supporting its application in noninvasive cystometry.